WHO declares global emergency over Zika virus spread

In this Wednesday, Jan. 27, 2016 photo, Aedes aegypti mosquitoes sit in a petri dish at the Fiocruz institute in Recife, Pernambuco state, Brazil. The mosquito is a vector for the proliferation of the Zika virus spreading throughout Latin America. New fig

A Sucre municipality worker fumigates for Aedes aegypti mosquitoes that transmit the Zika virus in the Petare neighborhood of Caracas, Venezuela, Monday, Feb. 1, 2016. Venezuela is reporting a jump in cases of a rare, sometimes paralyzing syndrome that ma

Musicians play samba at a street carnival parade during which health workers distributed kits with information about the Zika virus, on Ipanema beach in Rio de Janeiro, Brazil, Sunday, Jan. 31, 2016. The sign reads in Portuguese : "Get out Zika." Original

GENEVA (AP) — The World Health Organization declared an international emergency on Monday over the explosive spread of the mosquito-borne Zika virus, which is linked to birth defects in the Americas, saying it is an "extraordinary event."

The U.N. health agency convened an emergency meeting of independent experts in Geneva to assess the outbreak after noting a suspicious link between Zika's arrival in Brazil last year and a surge in the number of babies born with abnormally small heads.

"After a review of the evidence, the committee advised that the clusters of microcephaly and other neurological complications constitute an extraordinary event and public health threat to other parts of the world," WHO Director-General Margaret Chan said.

WHO estimates there could be up to 4 million cases of Zika in the Americas in the next year, but no recommendations were made to restrict travel or trade.

"It is important to understand, there are several measures pregnant women can take," Chan said. "If you can delay travel and it does not affect your other family commitments, it is something they can consider.

"If they need to travel, they can get advice from their physician and take personal protective measures, like wearing long sleeves and shirts and pants and use mosquito repellent."

The last such public health emergency was declared for the devastating 2014 Ebola outbreak in West Africa, which killed more than 11,000 people. A similar declaration was made for polio the year before.

Such emergency declarations are meant as an international SOS signal and usually trigger increased money and efforts to stop the outbreak, as well as prompting research into possible treatments and vaccines.

WHO officials say it could be six to nine months before science proves or disproves any connection between Zika and the spike in the number of babies born in Brazil with abnormally small heads.

WHO, which was widely criticized for its slow response to the 2014 Ebola crisis in West Africa, has been eager to show its responsiveness this time. Despite dire warnings that Ebola was out of control in mid-2014, WHO didn't declare an emergency until August, when nearly 1,000 people had died.

Its officials say that up to 4 million cases of Zika could turn up in the Americas within the next year. Zika was first identified in 1947 in a Ugandan forest but until last year, it wasn't believed to cause any serious effects; about 80 percent of infected people never experience symptoms. The virus has also been linked to Guillain-Barre syndrome, which causes muscle weakness and nerve problems.

"Of course, the world and the World Health Organization have all learned from the Ebola crisis," WHO spokesman Christian Lindmeier said earlier Monday before the emergencywas declared. "That's why we are trying to bring in the best experts we can gather for this event, to try to establish what steps to take and what the way forward should be."

Lindmeier credited authorities in Brazil for being "extremely transparent" since the Zikaoutbreak turned up there in May. He said WHO first raised the possible connection between the virus and abnormally small heads back in October — a prospect that has sown fear among many would-be mothers and pregnant women.

Brazilian officials shared lab samples with foreign experts and brought in scientists from abroad, he said.

"What we know so far is that the only microcephaly cases we see currently are from Brazil," Lindmeier said, noting that abnormally small heads in newborns can have many causes — such as the effects of herbicides, alcohol use, or drugs and toxins. "This is exactly what is the concerning question: why do we see this in Brazil?"

Jimmy Whitworth, an infectious diseases expert at the London School of Hygiene and Tropical Medicine, said we might soon see other babies born with malformed heads as the virus becomes entrenched in other countries.

"It could be that we're getting the strongest signal in Brazil," he said before WHO's annoucement. "But having these cases occurring and pinning it to Zika is tough."

Whitworth said it was important for WHO to act quickly, despite definitive evidence thatZika is responsible for the surge in microcephaly cases.

"For situations like this, you have to essentially have a 'no regrets' policy," he said. "Maybe this will be a false alarm when more information is available months later, but it's serious enough on the evidence we have right now that we have to act."

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Maria Cheng reported from London.

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